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Finding the Fourth Proportional to 905.86, 1,250.08 and 512.88

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Solution

The fourth proportional to 905.86, 1,250.08 and 512.88 is: 707.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.86 : 1,250.08 = 512.88 : x
  2. Step 2: Convert to fraction form
    905.86/1,250.08 = 512.88/x
  3. Step 3: Cross multiply
    905.86x = 1,250.08 × 512.88
  4. Step 4: Simplify right side
    905.86x = 641,141.03
  5. Step 5: Solve for x
    x = 641,141.03/905.86
  6. Step 6: Final answer
    x = 707.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.